Numbers represented in binary format ie:
000000101
#5 in decimal 1*2^2+1*2^0
#this shifted 1 place to the left is equivalent to
#mutliplying by two
000001010
#this is equal to 10 or 1*2^3+1*2^1
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2<<4  #2 is 00000010 in binary, the <<4 moves the bits left 4,00100000
+ which is 32
32>>3 #32 is 00100000 in binary, the >>3 moves the bits right 3, 00000
+100 which is 4
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For example 7 is 111 in binary. Shifting it one place left results in 1110 (digits coming from off the edge are zero), or 14. 111b shifted right once is 11 (a bit is shifted off), or 3. 7*2=14, and 7/2 is 3.5, the .5 is lost because of the one being shifted off.

Hope this helps.